Wireless Shaded Pole Induction Motor with Half-bridge Inverter and Dual-Frequency Resonant Network
Abstract : This article presented a single-phase shaded-pole induction motor (SPIM) system, which aims to work in an isolated environment. Compared with the previous wireless SPIM, this system employs less controlled switches and can work at full-resonant condition, while retaining the merit of secondary controllerless. The key is to employ a half-bridge inverter and a proper dual-frequency resonant network; thus, only two controlled switches are adopted at the motor side. Since the SPIM is purposely designed with a dual-stator winding, the system robustness and efficiency can be significantly improved. In this article, simulation has been conducted to verify the system's feasibility and self-drive ability. Meanwhile, a 30-W prototype has been built for the experimental verification, and the results show that this motor can achieve flexible speed control with the transfer distance of 20 mm and the transmission efficiency of 77%.
? These load parameters depend on several variables including the shape of the heating coil, the spacing between the heating coil and cooking vessel, their electrical conductivity and magnetic permeability, and the operating frequency.
? These reasons cause overall inverter system to operate unstably under constant frequency control because the performance of inverter is highly effected upon characteristics of load parameters.
? Therefore, the inverter system with a load-adaptive control circuit is required to operate successfully irrespective of variation of the load parameters.
? One of the main advantages of the half-bridge inverter is low voltage across the switches that is equal to the supply voltage.
? The key limitation of most stationary frame linear current regulation systems is their inability to eliminate steady-state error.
? The three phase synchronous – PI regulator solves this problem by shifting the base-band information back to where conventional regulator networks can be used.
? For such conventional linear controllers, it is the integral term that provides infinite gain at and therefore achieves zero steady-state error.
? Current regulation is an important issue for power electronic converters, and has particular application for high performance motor drives and boost type pulsewidth modulated (PWM) rectifiers.
• The proposed control strategy ensures a stable operation characteristics of overall inverter system and ZVS(Zero Voltage Switching) operation in spite of sensitive load parameters variation as well as power regulation, specially in the nonmagnetic heating loads.
• The validity of the proposed load-adaptive control circuit was verified by the simulation and experimental results for a prototype induction cooking system.
• In this paper, an effective control scheme incorporated in the voltage-fed half-bridge series resonant inverter for induction heating applications has been proposed, which is based upon a load-adaptive tuned frequency tracking scheme characterized through PLL control and its peripheral interface implementations.
? In this paper, concepts taken from carrier-servo control systems are used to develop a new P Resonant stationary frame regulator for single and three phase systems which achieves virtually the same steady-state and transient performance as a synchronous frame PI regulator.
? Synchronous frame regulators are generally accepted to have a better performance than stationary frame regulators, as they operate on dc quantities and hence can eliminate steady-state errors.
? The steady-state performance of this new regulator is similar to that achieved in but it is more stable and has a superior transient performance.
? It is simply required to re-calculate the digital filter co-efficient to suit the target frequency.
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